Spinning machine



Patented Mar. 29, 1 927.

UNITED STATES 623,908 PATENT, OFFICE.

ALBERT nmscnm'iminn, OF nmsnAoii, GERMANY.

srrmvmo MACHINE.

Application filed August 12, 1926, Serial No. 128,869, and in Germany August 28, 1925.

The fibres used in the spinning of rope yarn may either be hard or soft. Hard fibres such as sisal, manilla and the like have thick abrupt ends which tend to project, and the fibres do not therefore lend themselves to the production of smooth polished yarn, a circumstance which lessens their value. To remedy this defectattempts have been made to cover a core of hard fibres with a layer of soft fibres, for instance tow. which can be polished so that the yarn will present a smooth surface. This is generally effected by means of a gill spinning .frame wherein rib-shaped slivers of the two materials are delivered to a flyer by a shaft and pressing rollers while they are joined at an acute angle so that the covering material gets wound spirally about the core material as the latter is twisted. slivers are uniformly delivered, and any unevenness in the core, due to the fibres themselves or to the presence of extraneous particles, has a detrimental effect on the covering which thereby either becomes eircessively stretched, sometimes to the breaking point,

or applied too loosely to the core. In both instances the yarn will suffer in strength as well as in appearance, since the unevenly stretched materials will act separately in rem sisting the pull and are therefore more liable to break.

The object/of the present invention isto obviate these disadvantages and to produce a cored rope yarn which, while stronger I than yarn made exclusively of soft fibre, will equal thelatter in appearance. With this object in view the invention consists in forming the pressing roller for the covering ma terial with transversely extending recesses enabling the ribbon to slip in an intermittent fashion under the pull of the core so as to prevent overstraining, an arched plate being arranged so as to support and guide the two ribbons while they are being united. This arrangement enables a thin covering ribbon to be employed without risk of breakage, and a smooth and uniformly twisted .yarn will be obtained. The plate is preferably pivoted and spring-supported so that it will tend to keep the yarn in uniform tension and prevent uneven winding of the bobbin from resulting in unevenness in the twist. Prolonged changes in the pull are compen r sated for by the provision of an additional,

hand-operated brake applied to the bobbin,-

In this arrangement the two Fig. 1 of the accompanying drawings represents a sectional side View of the arrangement, and

Fig; 2, a front view of the same.-

T he core material passes in known manner as a ribbon-shaped sliver between feed rollers a and over the gill bars I) to a delivery shaft 0 which also serves as a drawing roller and for this purpose co-operates with a pressing roller d. From the shafts the ribbon goes to a flyer (1 whereby it is twisted and at the same time wound on abobbin f. The shaft 0 also supplies a ribbon of covering material whichis controlled by a press ing. roller g arranged eoaxially with the roller (l. Immediately in front of the shaft 0 there is, according-to the invention, an archedplate h which'supports and guides the two slivers and causes the covering material to be wound uniformly about the core as the latter is twisted by the flyer. The slivers meet at an acute angle and the covering material winds in a steep spiral round the core and produces a firm, long-stapled yarn. v

As the covering material is wound over the circumference of the core, it is necessary to feed it at greater speed than the core material. For this purpose, the covering material is led, in known manner, over an.enlarged portion of the delivery shaft. According to the invei'ition the enlargement of this portion is modified so that the core exerts sufficient pull on the covering mate- .rial to prevent accidental slackening. To'

loo

greater feed, the recesses i are tapered, as

shown in Fig. 2, so that the materi z s can slip more at one side of the ribbon than at v the other.

The same effect may be obtained by making the roller 7 and the shaft portion 0 conical instead of cylindrical. Evidently the ribbon remains in the plane recesses can be made in the shaft portion lower end of the plate k, of a soft elastic 0 instead of in the roller 9.

Irregular pull on thesyarn, which would detrimentally affect the twisting process on the plate It, is compensated for by arranging the plate on a pivot L and supporting it by a spring Z which maintains regular tension. The spring effect may be adjustable. More durable changes in the pull may be compensated for by means of an additional bobbin brake m arranged so that it can be adjusted by hand according to need. The usual automatic brake may be employed at the same time so as to meet relaxed resistance due to the growth of the bobbin. Naturally the brake m may also be adapted to act automatically for the same purpose. The additional brake has the advantage that the device can easily be adjusted for changes in the nature of the material, for instance from long to short fibre and from coarse to fine yarn or vice versa. In the ease of long fibres, for instance, less twist and therefore more bobbin resistance is required than in the case of short ones.

The plate It also serves as a means for polishing the yarn. In the first place the core material is evened out by being passed through a trumpet mouth a at the upper end of the plate. Projecting fibre ends will be kept down by the trumpet while they are being twisted into the core by adjacent fibres. The narrow end of the trumpet is preferably rendered elastic for instance by forming the upper half into a separate hinged shell 0 which is held by spring pressure against the rigid lower half or against the enclosed sliver. While the covering material is led over the plate in the plane of the pressing roller g, the core material is led in at an angle to said plane, the plate It being formed with a raised edge 7) whereby the core is guided. The edge and the. plate itself form together a guide surface with which the yarn contacts to the extent of at least one quarter of itscircurnference, and the plate will therefore have a considerable polishing effect on the yarn. As the covering of its pressing roller, any fibres which adhere to and follow the roller will, when stripped off, return to the ribbon.

To further the polishing of the yarn, means are provided, for instance a dripping nozzle 9, for moistening the yarn at the point where the covering is applied to the core. Moistened rollers may be used for the same purpose. This surface moistening of the yarn allows a quick drying of the same so that it can be wound and kept on the bobbins without riskof growing mouldy. To ensure proper drying, hot air may be passed across the yarn on its way to the bobbin. Still further polish may be a plied to the yarn by the provision, at t e polishing element 1' of felt or the like arranged so as to press the yarn against the plate. As the twisting and polishing of the yarn takes place at the same time, the direction of the polishing will be along the fibres, and loose fibre ends will therefore be more effectively smoothened down than when the polishing takes place in the axial direction of the yarn.

By this simultaneous twisting and covering of the'core and polishing of the yarn while the materials pass from the deliyery shaft to the sliver, a considerable improvement in the production of rope yarn is achieved.

I claim: 1. In a machine for spinning cored rope yarn, the combination with a delivery shaft and with two pressing rollers which cooperate .with said shaft for supplying ribbonshaped core and covering materials to a fiyer spindle, of an arched plate arranged so as to support and guide the materials while they are being united, the pressing roller for the covering material being formed with transversely extending recesses enabling the materials to slip under the pull of the core.

2. A structure according to claim 1'where in the roller recesses taper so as to allow the covering ribbon greater slip at one side of the roller than at the other, substantially as and for the purpose set forth.

3. A structure according to claim 1 where in the plate is pivoted and spring-supported so as to keep the yarn in uniform tension.

4 The structure claimed in claim 1 and a trumpet mouth arranged so as to receive the core material from the delivery shaft and feed it on to the plate, the narrow end of said trumpet mouth being resilient.

' 5. A structure according to claim 1 wherein the plate is arranged so as to maintain the covering material in the plane of its pressing roller while the core material is fed at an angle thereto, the plate being formed with a raised edge along which the core material is guided.

6. The structure claimed in claim 1 including means for moistening the yarn on the plate, and means on said plate for holding a polishing element against the moistened yarn.

7. The structure claimed in claim 1 including means for moistening the yarn on the plate, means on said plate for holding a polishing element against the moistened yarn, and means for drying the yarn under the influence of hot air.

8. The structure claimed in claim 1 including a bobbin for taking up the yarn from the flyer and means for braking said bobbin.

' ALBERT HIRSCHMIILLER. 

